Translate Qt app

SGaist

Hi,

Why is it odd ? It's a pretty simple way for the developer to know that the language changed and he can act accordingly. Not all widget have text to translate nor do they systematically need translation.

mostefa

Hi @SGaist

Thank you for your answer,

Instead of calling changeEvent in every widget,

Is there a way to call changeEvent just on my mainWindow like this, and then translate widget that need to be translated:

void MyMainWindow::changeEvent(QEvent *e)
{
    QWidget::changeEvent(e);
    switch (e->type())
    {
    case QEvent::LanguageChange:
    {
        ui->retranslateUi(this);
       // Here i want to translate or my child widgets
       widget1->retranslateUi//or something like this
       widget2->retranslateUi//or something like this

...
        break;
    }
    default:
        break;
   }
}

SGaist

Sure you can do it like that but that would mean adding add a method to all your other widgets. However, IIRC, widgets created through designer already handle that part so there's no need for that.

Do you have other widgets that are not designer based ?

mostefa

@SGaist

No,all my widgets that need to be translated are based on qt designer,

Widgets does not have retranslateUi method , so i don't know how to tell my widgets to be translated from my mainWindow

case QEvent::LanguageChange:
  {
      ui->retranslateUi(this);
     // Here i want to translate or my child widgets
     widget1->//looking for the function to tell widget to be translated
     widget2->//looking for the function to tell widget to be translated

...
      break;
  }

any idea how to do that ?

SGaist

No it's a method implemented in the ui object class.

If you don't want that change event in all your classes, like I wrote before, you have to add a method to each of your widget calling ui->retranslateUi(this).

Thus adding:

void MyWidget::changeEvent(QEvent *event)
{
    if (event->type() == QEvent::LanguageChange) {
        ui->retranslateUi(this);
    } else
        QWidget::changeEvent(event);
}

to your widgets would be a lot cleaner.

mostefa

@SGaist

Ok , thank you for your help,

Well i think that i will reimplement the changeEvent for every widget

ich_heise_deb

Hi All,

My application architecture demands that i cannot use the overloaded changeEvent method in all the widgets...as in my application i am using Qpushbutton which does not have the changeEvent method in it....one option is to use multiple slots for the different widgets after the changeEvent emits one signal from the base mainwidget class.....On solution i have thought is to replace the Qpushbuttton with QAbstractbutton...but that can create other problems in the architecture as the App is adding QPushbutton dynamically based on the XML file parsing.

SGaist

QPushButton does have this method. All QWidget derived classes have that method.

I don't see why you would need to subclass QPushButton in that case. You only need to implement the changeEvent method in your complex custom widgets that will create other "base" widgets like QPushButton.

ich_heise_deb

Got it...but now suppose i have an Item like QStandardItem in my code which will be used to show the data in a view....but how the changeEvent shall work in the above case?

SGaist

Do you mean you are generating QStandardItem which content is translated within your code ? If that's the case can you show how you do that ?

ich_heise_deb

Smthing like this...

Info->TreeItem = new QStandardItem();
Info->TreeItem->setText(QApplication::translate("Project Tree", Info->TreeBranch->Label->Primary) );

So in the above case you dont hv a changeEvent in the QStandardItem class hence will not be able to use installtranslator() in the code

SGaist

What would the value of Primary be ? Something fixed that is translatable or a dynamic text ?

In any case, this is typically a situation where you implement the changeEvent method of the class where you handle the QStandardItems.